]>
jfr.im git - solanum.git/blob - ircd/parse.c
2 * charybdis: an advanced ircd.
3 * parse.c: The message parser.
5 * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
6 * Copyright (C) 1996-2002 Hybrid Development Team
7 * Copyright (C) 2002-2005 ircd-ratbox development team
8 * Copyright (C) 2007-2016 William Pitcock
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
44 rb_dictionary
*cmd_dict
= NULL
;
45 rb_dictionary
*alias_dict
= NULL
;
47 static void cancel_clients(struct Client
*, struct Client
*);
48 static void remove_unknown(struct Client
*, const char *, char *);
50 static void do_numeric(int, struct Client
*, struct Client
*, int, const char **);
51 static void do_alias(struct alias_entry
*, struct Client
*, char *);
53 static int handle_command(struct Message
*, struct MsgBuf
*, struct Client
*, struct Client
*);
55 static char buffer
[1024];
57 /* turn a string into a parc/parv pair */
59 char *reconstruct_parv(int parc
, const char *parv
[])
61 static char tmpbuf
[BUFSIZE
]; int i
;
63 rb_strlcpy(tmpbuf
, parv
[0], BUFSIZE
);
64 for (i
= 1; i
< parc
; i
++)
66 rb_strlcat(tmpbuf
, " ", BUFSIZE
);
67 rb_strlcat(tmpbuf
, parv
[i
], BUFSIZE
);
74 * given a raw buffer, parses it and generates parv and parc
77 parse(struct Client
*client_p
, char *pbuffer
, char *bufend
)
79 struct Client
*from
= client_p
;
86 s_assert(MyConnect(client_p
));
87 s_assert(client_p
->localClient
->F
!= NULL
);
88 if(IsAnyDead(client_p
))
93 /* XXX this should be done before parse() is called */
99 res
= msgbuf_parse(&msgbuf
, pbuffer
);
102 ServerStats
.is_empt
++;
106 if (msgbuf
.origin
!= NULL
&& IsServer(client_p
))
108 from
= find_client(msgbuf
.origin
);
110 /* didnt find any matching client, issue a kill */
113 ServerStats
.is_unpf
++;
114 remove_unknown(client_p
, msgbuf
.origin
, pbuffer
);
118 /* fake direction, hmm. */
119 if(from
->from
!= client_p
)
121 ServerStats
.is_wrdi
++;
122 cancel_clients(client_p
, from
);
127 if(IsDigit(*msgbuf
.cmd
) && IsDigit(*(msgbuf
.cmd
+ 1)) && IsDigit(*(msgbuf
.cmd
+ 2)))
130 numeric
= atoi(msgbuf
.cmd
);
131 ServerStats
.is_num
++;
135 mptr
= rb_dictionary_retrieve(cmd_dict
, msgbuf
.cmd
);
137 /* no command or its encap only, error */
138 if(!mptr
|| !mptr
->cmd
)
140 if (IsPerson(client_p
))
142 struct alias_entry
*aptr
= rb_dictionary_retrieve(alias_dict
, msgbuf
.cmd
);
145 if (msgbuf
.n_para
< 2)
147 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
149 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
154 do_alias(aptr
, client_p
, reconstruct_parv(msgbuf
.n_para
- 1, msgbuf
.para
+ 1));
160 sendto_one(from
, form_str(ERR_UNKNOWNCOMMAND
),
161 me
.name
, from
->name
, msgbuf
.cmd
);
163 ServerStats
.is_unco
++;
167 mptr
->bytes
+= msgbuf
.parselen
;
172 do_numeric(numeric
, client_p
, from
, msgbuf
.n_para
, msgbuf
.para
);
176 if(handle_command(mptr
, &msgbuf
, client_p
, from
) < -1)
179 for (p
= pbuffer
; p
<= end
; p
+= 8)
182 /* Its expected this nasty code can be removed
183 * or rewritten later if still needed.
187 for (; p
<= end
; p
++)
189 ilog(L_MAIN
, "%02x |%c", p
[0], p
[0]);
194 "%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
195 p
[0], p
[1], p
[2], p
[3], p
[4], p
[5],
196 p
[6], p
[7], p
[0], p
[1], p
[2], p
[3], p
[4], p
[5], p
[6], p
[7]);
205 * inputs - pointer to message block
206 * - pointer to message buffer
207 * - pointer to client
208 * - pointer to client message is from
209 * output - -1 if error from server
213 handle_command(struct Message
*mptr
, struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*from
)
215 struct MessageEntry ehandler
;
216 MessageHandler handler
= 0;
217 char squitreason
[80];
219 if(IsAnyDead(client_p
))
222 if(IsServer(client_p
))
227 ehandler
= mptr
->handlers
[from
->handler
];
228 handler
= ehandler
.handler
;
230 /* check right amount of params is passed... --is */
231 if(msgbuf_p
->n_para
< ehandler
.min_para
||
232 (ehandler
.min_para
&& EmptyString(msgbuf_p
->para
[ehandler
.min_para
- 1])))
234 if(!IsServer(client_p
))
236 sendto_one(client_p
, form_str(ERR_NEEDMOREPARAMS
),
238 EmptyString(client_p
->name
) ? "*" : client_p
->name
,
240 if(MyClient(client_p
))
246 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
247 "Dropping server %s due to (invalid) command '%s'"
248 " with only %zu arguments (expecting %zu).",
249 client_p
->name
, mptr
->cmd
, msgbuf_p
->n_para
, ehandler
.min_para
);
251 "Insufficient parameters (%zu < %zu) for command '%s' from %s.",
252 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
, client_p
->name
);
253 snprintf(squitreason
, sizeof squitreason
,
254 "Insufficient parameters (%zu < %zu) for command '%s'",
255 msgbuf_p
->n_para
, ehandler
.min_para
, mptr
->cmd
);
256 exit_client(client_p
, client_p
, client_p
, squitreason
);
260 (*handler
) (msgbuf_p
, client_p
, from
, msgbuf_p
->n_para
, msgbuf_p
->para
);
265 handle_encap(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
,
266 const char *command
, int parc
, const char *parv
[])
268 struct Message
*mptr
;
269 struct MessageEntry ehandler
;
270 MessageHandler handler
= 0;
272 mptr
= rb_dictionary_retrieve(cmd_dict
, command
);
274 if(mptr
== NULL
|| mptr
->cmd
== NULL
)
277 ehandler
= mptr
->handlers
[ENCAP_HANDLER
];
278 handler
= ehandler
.handler
;
280 if((size_t)parc
< ehandler
.min_para
||
281 (ehandler
.min_para
&& EmptyString(parv
[ehandler
.min_para
- 1])))
284 (*handler
) (msgbuf_p
, client_p
, source_p
, parc
, parv
);
292 * side effects - MUST MUST be called at startup ONCE before
293 * any other keyword hash routine is used.
298 cmd_dict
= rb_dictionary_create("command", strcasecmp
);
303 * inputs - command name
304 * - pointer to struct Message
306 * side effects - load this one command name
307 * msg->count msg->bytes is modified in place, in
308 * modules address space. Might not want to do that...
311 mod_add_cmd(struct Message
*msg
)
313 s_assert(msg
!= NULL
);
317 if (rb_dictionary_find(cmd_dict
, msg
->cmd
) != NULL
)
324 rb_dictionary_add(cmd_dict
, msg
->cmd
, msg
);
329 * inputs - command name
331 * side effects - unload this one command name
334 mod_del_cmd(struct Message
*msg
)
336 s_assert(msg
!= NULL
);
340 rb_dictionary_delete(cmd_dict
, msg
->cmd
);
345 * inputs - client who sent us the message, client with fake
347 * outputs - a given warning about the fake direction
351 cancel_clients(struct Client
*client_p
, struct Client
*source_p
)
353 /* ok, fake prefix happens naturally during a burst on a nick
354 * collision with TS5, we cant kill them because one client has to
355 * survive, so we just send an error.
357 if(IsServer(source_p
) || IsMe(source_p
))
359 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
360 "Message for %s[%s] from %s",
361 source_p
->name
, source_p
->from
->name
,
366 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
367 "Message for %s[%s@%s!%s] from %s (TS, ignored)",
371 source_p
->from
->name
,
378 * inputs - client who gave us message, supposed sender, buffer
380 * side effects - kills issued for clients, squits for servers
383 remove_unknown(struct Client
*client_p
, const char *lsender
, char *lbuffer
)
385 int slen
= strlen(lsender
);
387 struct Client
*server
;
389 /* meepfoo is a nickname (ignore)
390 * #XXXXXXXX is a UID (KILL)
391 * #XX is a SID (SQUIT)
392 * meep.foo is a server (SQUIT)
394 if((IsDigit(lsender
[0]) && slen
== 3) ||
395 (strchr(lsender
, '.') != NULL
))
397 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
398 "Unknown prefix (%s) from %s, Squitting %s",
399 lbuffer
, client_p
->name
, lsender
);
402 ":%s SQUIT %s :(Unknown prefix (%s) from %s)",
403 get_id(&me
, client_p
), lsender
,
404 lbuffer
, client_p
->name
);
406 else if(!IsDigit(lsender
[0]))
409 sendto_realops_snomask(SNO_DEBUG
, L_ALL
,
410 "Invalid prefix (%s) from %s",
411 lbuffer
, client_p
->name
);
414 memcpy(sid
, lsender
, 3);
416 server
= find_server(NULL
, sid
);
417 if (server
!= NULL
&& server
->from
== client_p
)
418 sendto_one(client_p
, ":%s KILL %s :%s (Unknown Client)",
419 get_id(&me
, client_p
), lsender
, me
.name
);
427 * parc number of arguments ('sender' counted as one!)
428 * parv[1]..parv[parc-1]
429 * pointers to additional parameters, this is a NULL
430 * terminated list (parv[parc] == NULL).
433 * Numerics are mostly error reports. If there is something
434 * wrong with the message, just *DROP* it! Don't even think of
435 * sending back a neat error message -- big danger of creating
436 * a ping pong error message...
439 do_numeric(int numeric
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
441 struct Client
*target_p
;
442 struct Channel
*chptr
;
444 if(parc
< 2 || !IsServer(source_p
))
447 /* Remap low number numerics. */
452 * Prepare the parameter portion of the message into 'buffer'.
453 * (Because the buffer is twice as large as the message buffer
454 * for the socket, no overflow can occur here... ...on current
455 * assumptions--bets are off, if these are changed --msa)
456 * Note: if buffer is non-empty, it will begin with SPACE.
460 char *t
= buffer
; /* Current position within the buffer */
462 int tl
; /* current length of presently being built string in t */
463 for (i
= 2; i
< (parc
- 1); i
++)
465 tl
= sprintf(t
, " %s", parv
[i
]);
468 sprintf(t
, " :%s", parv
[parc
- 1]);
471 if((target_p
= find_client(parv
[1])) != NULL
)
476 * We shouldn't get numerics sent to us,
477 * any numerics we do get indicate a bug somewhere..
479 /* ugh. this is here because of nick collisions. when two servers
480 * relink, they burst each other their nicks, then perform collides.
481 * if there is a nick collision, BOTH servers will kill their own
482 * nicks, and BOTH will kill the other servers nick, which wont exist,
483 * because it will have been already killed by the local server.
485 * unfortunately, as we cant guarantee other servers will do the
486 * "right thing" on a nick collision, we have to keep both kills.
487 * ergo we need to ignore ERR_NOSUCHNICK. --fl_
489 /* quick comment. This _was_ tried. i.e. assume the other servers
490 * will do the "right thing" and kill a nick that is colliding.
491 * unfortunately, it did not work. --Dianora
493 /* note, now we send PING on server connect, we can
494 * also get ERR_NOSUCHSERVER..
496 if(numeric
!= ERR_NOSUCHNICK
&&
497 numeric
!= ERR_NOSUCHSERVER
)
498 sendto_realops_snomask(SNO_GENERAL
, L_ADMIN
,
499 "*** %s(via %s) sent a %03d numeric to me: %s",
501 client_p
->name
, numeric
, buffer
);
504 else if(target_p
->from
== client_p
)
506 /* This message changed direction (nick collision?)
512 /* csircd will send out unknown umode flag for +a (admin), drop it here. */
513 if(numeric
== ERR_UMODEUNKNOWNFLAG
&& MyClient(target_p
))
516 /* Fake it for server hiding, if its our client */
517 sendto_one(target_p
, ":%s %03d %s%s",
518 get_id(source_p
, target_p
), numeric
,
519 get_id(target_p
, target_p
), buffer
);
522 else if((chptr
= find_channel(parv
[1])) != NULL
)
523 sendto_channel_flags(client_p
, ALL_MEMBERS
, source_p
, chptr
,
525 numeric
, chptr
->chname
, buffer
);
528 static void do_alias(struct alias_entry
*aptr
, struct Client
*source_p
, char *text
)
531 struct Client
*target_p
;
533 if (!IsFloodDone(source_p
) && source_p
->localClient
->receiveM
> 20)
534 flood_endgrace(source_p
);
536 p
= strchr(aptr
->target
, '@');
540 target_p
= find_server(NULL
, p
+ 1);
541 if (target_p
!= NULL
&& IsMe(target_p
))
546 /* nick, must be +S */
547 target_p
= find_named_person(aptr
->target
);
548 if (target_p
!= NULL
&& !IsService(target_p
))
552 if (target_p
== NULL
)
554 sendto_one_numeric(source_p
, ERR_SERVICESDOWN
, form_str(ERR_SERVICESDOWN
), aptr
->target
);
558 if (text
!= NULL
&& *text
== ':')
560 if (text
== NULL
|| *text
== '\0')
562 sendto_one(source_p
, form_str(ERR_NOTEXTTOSEND
), me
.name
, source_p
->name
);
566 /* increment the hitcounter on this alias */
569 sendto_one(target_p
, ":%s PRIVMSG %s :%s",
570 get_id(source_p
, target_p
),
571 p
!= NULL
? aptr
->target
: get_id(target_p
, target_p
),
576 m_not_oper(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
578 sendto_one_numeric(source_p
, ERR_NOPRIVILEGES
, form_str(ERR_NOPRIVILEGES
));
582 m_unregistered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
585 * I don't =really= want to waste a bit in a flag
586 * number_of_nick_changes is only really valid after the client
587 * is fully registered..
589 if(client_p
->localClient
->number_of_nick_changes
== 0)
591 sendto_one(client_p
, form_str(ERR_NOTREGISTERED
), me
.name
);
592 client_p
->localClient
->number_of_nick_changes
++;
597 m_registered(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
599 sendto_one(client_p
, form_str(ERR_ALREADYREGISTRED
), me
.name
, source_p
->name
);
603 m_ignore(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])